Abstract

The round-trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry ($\varphi$-OTDR). Unlike the uniform laser pulse interval in conventional $\varphi$-OTDR, we randomly modulate the pulse interval so that an equivalent sub-Nyquist additive random sampling (sNARS) is realized for every sensing point of the long interrogation fiber. For a $\varphi$-OTDR system with 10 km sensing length, the sNARS method is optimized by theoretical analysis and Monte Carlo simulation, and the experimental results verify that a wideband sparse signal can be identified and reconstructed. Such a method can broaden the vibration frequency response range of $\varphi$-OTDR, which is of great significance in sparse-wideband-frequency vibration signal detection.

© 2018 Optical Society of America

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